Non-flammable contact adhesive

ABSTRACT

A non-flammable contact adhesive includes a solvent composed of a mixture of flammable and non-flammable components. The contact adhesive includes copolymer rubbers, tackifiers, stabilizer resins, and carbon dioxide gas.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation in part of U.S. patent applicationSer. No. 16/242,056, entitled “NON-FLAMMABLE CONTACT ADHESIVE,” filedJan. 8, 2019, which is currently pending, which claims the benefit ofU.S. Provisional Patent Application Ser. No. 62/615,670, entitled“NON-FLAMMABLE CONTACT ADHESIVE,” filed Jan. 10, 2018, both of which areincorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to non-flammable contactadhesives.

2. Description of the Related Art

Solvent-based contact adhesives offer a variety of benefits that arewell known throughout the industry. For example, solvent-based contactadhesives commonly offer high shear strength, good adhesion with avariety of materials, and short dry times. However, solvent-basedcontact adhesives are often flammable.

SUMMARY OF THE INVENTION

It is, therefore, an object of the present invention to provide anon-flammable contact adhesive including a solvent composed of a mixtureof flammable and non-flammable components, copolymer rubbers,tackifiers, stabilizer resins, and carbon dioxide gas.

It is also an object of the present invention to provide a non-flammablecontact adhesive wherein the carbon dioxide gas is included at a ratioof 1.5 pounds of carbon dioxide per 30 pounds of the cumulative weightof the solvent, copolymer rubbers, tackifiers, and stabilizer resins.

It is another object of the present invention to provide a non-flammablecontact adhesive including nitrogen gas.

It is also a further object of the present invention to provide anon-flammable contact adhesive wherein the non-flammable contactadhesive is an aerosol adhesive.

It is also an object of the present invention to provide a non-flammablecontact adhesive wherein the solvent is composed oftrans-dichloroethylene, a hydrofluoroolefin, and a hydrofluorocarbon.

It is another object of the present invention to provide a non-flammablecontact adhesive wherein the solvent is composed of 40 to 90 weightpercent of trans-dichloroethylene, 5 to 20 weight percent ofhydrofluoroolefin, and 5 to 20 weight percent of hydrofluorocarbonfluid.

It is a further object of the present invention to provide anon-flammable contact adhesive wherein the solvent is composed of 40 to90 weight percent of trans-dichloroethylene, 5 to 20 weight percent ofhydrofluoroolefin, and 5 to 10 weight percent of hydrofluorocarbon fluidwith zero ozone-depletion potential.

It is also an object of the present invention to provide a non-flammablecontact adhesive wherein the copolymer rubbers arepoly(styrene-isoprene-styrene) resins andpoly(styrene-butadiene-styrene) resins.

It is another object of the present invention to provide a non-flammablecontact adhesive wherein the copolymer rubbers are composed ofapproximately 80% poly(styrene-isoprene-styrene) resins and 20%poly(styrene-butadiene-styrene) resins.

It is a further object of the present invention to provide anon-flammable contact adhesive wherein the trans-dichloroethylene istrans-1,2-dichloroethylene.

It is also an object of the present invention to provide a non-flammablecontact adhesive wherein the hydrofluoroolefin istrans-1-chloro-3,3,3-trifluoropropene.

It is another object of the present invention to provide a non-flammablecontact adhesive wherein the hydrofluorocarbon fluid is1,1,1,2,2,3,4,5,5,5-decafluoropentane.

It is a further object of the present invention to provide anon-flammable contact adhesive wherein the solvent further includestert-butyl acetate and parachlorobenzotrifluoride (PCBTF),trans-dichloroethylene, a hydrofluoroolefin, and a hydrofluorocarbonfluid.

It is also an object of the present invention to provide a non-flammablecontact adhesive wherein the tackifiers are a rosin esters, aliphaticresins, cycloaliphatic hydrocarbon resins, water-white thermoplasticresins made from purified aromatic hydrocarbon monomers, polyterpeneresins, or terpene phenolic resins.

It is another object of the present invention to provide a non-flammablecontact adhesive wherein the stabilizing resins aretris(2,4,-di-tert-butylphenyl) phosphite, octadecyl-3-(3,5-di-tertbutyl-4-hydrophenyl)-propionate, or pentaerythritoltetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate).

It is further an object of the present invention to provide anon-flammable contact adhesive wherein the non-flammable contactadhesive has a percent solid level of 15% to 36% with the solventconstituting 64% to 85% by weight of the non-flammable contact adhesive.

It is also an object of the present invention to provide a non-flammablecontact adhesive wherein the non-flammable contact adhesive has 70 toapproximately 130partsbyweightperhundredpartsbyweightblockcopolymerrubberoftackifiersand0.5 to 8 parts by weight per hundred parts by weight block copolymerrubber of stabilizers.

Other objects and advantages of the present invention will becomeapparent from the following detailed description when viewed inconjunction with the accompanying drawings, which set forth certainembodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is schematic relating to the process for balancing solvents toachieve the present non-flammable contact adhesive.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The detailed embodiments of the present invention are disclosed herein.It should be understood, however, that the disclosed embodiments aremerely exemplary of the invention, which may be embodied in variousforms. Therefore, the details disclosed herein are not to be interpretedas limiting, but merely as a basis for teaching one skilled in the arthow to make and/or use the invention.

The present invention relates to a non-flammable contact adhesive. Inparticular, the non-flammable contact adhesive of the present inventionuses a blend of solvents that both dissolve the rubbers, resins, andadditives (to give the needed adhesive performance) along with thesuppression of the flash point of the formulation.

The solvent blend has the solvating ability to dissolve rubber resins(both poly(styrene-isoprene) resins and poly(styrene-butadiene) resins).Also, the solvents dissolve tackifiers, heat stabilizing resins, andoxidative stabilizing additives which are used in the manufacture of thenon-flammable contact adhesive in accordance with the present invention.These materials provide a rubber based contact adhesive that passesrequired performance requirements for bonding High Pressure DecorativeLaminate (HPDL) to wood-based substrate. Also, the solvents provideevaporation behavior that allows them to be used under pressure, alongwith nitrogen gas, to give aerosol like (canister) spray capabilities.The non-flammable contact adhesive of present invention is sold as botha bulk adhesive (which is used with conventional brush, canisteradhesive, or spray from pressurized spray pots like normal contactadhesive) and as aerosol adhesive that is non-flammable.

In accordance with a preferred embodiment, the non-flammable contactadhesive is composed of a solvent mixture consisting oftrans-dichloroethylene, Solstice® PF-C or PF (a hydrofluoroolefin), andVertrel™ XF (a proprietary hydrofluorocarbon fluid with zeroozone-depletion potential). In accordance with this embodiment, thetrans-dichloroethylene is preferably trans-1,2-dichloroethylene, theSolstice® PF-C is trans-1-chloro-3,3,3-trifluoropropene, and theVertrel™ XF is 1,1,1,2,2,3,4,5,5,5-decafluoropentane. These solventsmake up the bulk of the non-flammable contact adhesive formulation.

In accordance with another embodiment, the non-flammable contactadhesive is composed of a solvent mixture consisting of tert-butylacetate, parachlorobenzotrifluoride (PCBTF), trans-dichloroethylene,Solstice® PF-C or PF (a hydrofluoroolefin), and Vertrel™ XF (aproprietary hydrofluorocarbon fluid with zero ozone-depletionpotential). In accordance with this embodiment, the tert-Butyl acetate,the Solstice® PF-C is trans-1-chloro-3,3,3-trifluoropropene, and theVertrel™ XF is 1,1,1,2,2,3,4,5,5,5-decafluoropentane. These solventsmake up the bulk of the non-flammable contact adhesive formulation.

The remainder of the non-flammable contact adhesive is principallycomposed of copolymer rubbers, tackifiers, and stabilizers (that is,antioxidants composed of heat stabilizing resins and oxidativestabilizing resins).

With regard to the copolymer rubbers, the copolymer rubbers used inaccordance with the present invention are poly(styrene-isoprene-styrene)resins (in particular, Kraton® D1164 PT (which is a clear, lineartriblock copolymer based on styrene and isoprene with a polystyrenecontent of 29%), Kraton® D1126 PT (which is a clear, radial copolymerbased on styrene and isoprene, with a polystyrene content of 21%),Vector® 4211A ((EMV-2114) which is a poly(styrene-isoprene-styrene)resin, that is a triblock copolymer with a narrow molecular weightdistribution), and Vector® 4230 ((EMV-4230) which is a radialpoly(styrene-isoprene-styrene) copolymer resin, that is a radial blockcopolymer with a narrow molecular weight distribution)), andpoly(styrene-butadiene-styrene) resins (in particular, Vector® 2518((EMV-2518) which is a poly(styrene-butadiene-styrene) resin, that is atriblock copolymer with a narrow molecular weight distribution)). It isalso appreciated the neoprene, styrene ethylene butylene styrene (SEBS),and styrene-butadiene rubber (SBR) may be utilized as a rubber inaccordance with the present invention. In accordance with a preferredembodiment, the copolymer rubbers are composed of approximately 80%Kraton® poly(styrene-isoprene-styrene) resins (wherein half is Kraton®D1164PT and half is Kraton D1126 PT) and 20% Vector®poly(styrene-butadiene-styrene) resins.

With regard to the tackifiers, the tackifiers used in accordance withthe present invention are Sylvatac™ mRE 98 manufactured by Kraton®(which is a rosin ester, in particular a pentaerythritol ester of talloil rosin that is a broadly compatible tackifier (listed as proprietaryby supplier)), Sylvatac™ RE 4291 manufactured by Kraton® (which is arosin ester that is a broadly compatible tackifier (listed asproprietary by supplier)) Escorez™ 1315 and 5637 manufactured byExxonMobil™ (which are tackifiers wherein Escorez™ 1315 is composed ofaliphatic resin with a high softening point designed to provide hightemperature performance and cohesive strength with a variety of adhesivepolymers and Escorez™ 5637 is a very light color aromatic modified,cycloaliphatic hydrocarbon resin designed to tackify a variety ofadhesive polymers (listed as hydrocarbon resin by supplier)), Endex™ 160manufactured by Eastman® (which is a tackifier composed of a water-whitethermoplastic resin made from purified aromatic hydrocarbon monomers andis used to modify the melt flow and increase the temperature resistanceof styrenic plastic and rubber and reinforces the styrene end blocks ofstyrenic block copolymers (listed as hydrocarbon resin by supplier)),Piccolyte® S125 manufactured Pinova (which is a polyterpene resin thatis a pale, inert, low molecular weight, thermoplastic hydrocarbon resinand functions as a tackifier), and TPR (Terpene Phenolic Resin) 160(which is a terpene phenolic resin sold through Global Chemsource Inc.It should be noted that the Escorez™ a and Endex™ resins vary inperformance as they provide different levels of heat resistance andtackifying performance (often termed as heat resistance and greenstrength).

With regard to the stabilizing resins, they have been selected tofunction for the purpose of both heat stabilization and oxidativestabilization. In accordance with a preferred embodiment the stabilizingresins used in accordance with the present invention are Irgafos® 168manufactured by BASF® (which is tris(2,4,-di-tert-butylphenyl) phosphiteand functions as a hydrolytically stable organo-phosphite processingstabilizer to keep the adhesive from degradation which is usually oxygenand heat (or both) generated) and two Irganox® stabilizing resinsmanufactured by BASF®. The first of the two Irganox® stabilizing resinsis Irganox® 1076 which is octadecyl-3-(3,5-di-tertbutyl-4-hydrophenyl)-propionate and functions as a highly efficient,non-discoloring, sterically hindered primary phenolic antioxidantstabilizer that protects organic substrates against thermo-oxidativedegradation (that is, it keeps the adhesive from degradation which isusually oxygen and heat (or both) generated)). The second of the twoIrganox® stabilizing resins is Irganox® 1010 which is pentaerythritoltetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate) and functions as ahighly efficient, non-discoloring, sterically hindered primary phenolicantioxidant stabilizer that protects organic substrates againstthermo-oxidative degradation (that is, it keeps the adhesive fromdegradation when oxygen and heat (or both) are generated). It should benoted the three different stabilizers discussed above (in particular,Irgafos® 168, Irganox® 1076 and Irganox® 1010) are used to compensatefor the potential stability degradation.

In addition, dye may be added to help the customer see the amount ofadhesive applied to the substrate and the laminate or the adhesive maybe produced with its natural (substantially clear) color.

With the foregoing in mind, the non-flammable contact adhesive of thepresent invention may broadly be thought of as comprising a solventadded in an amount sufficient to result in a final non-flammable contactadhesive having a percent solid level of 15% to 36% with the solventconstituting 64% to 85% by weight of the non-flammable contact adhesive;wherein the solvent is composed of 40 to 90 weight percent oftrans-dichloroethylene, 5 to 20 weight percent of hydrofluoroolefin, and5 to 10 weight percent of hydrofluorocarbon fluid with zeroozone-depletion potential.

In addition, the non-flammable contact adhesive of the present inventionhas 70 to approximately 130 parts by weight per hundred parts by weightblock copolymer rubber (phr)) of tackifiers and 0.5 to 8 parts by weightper hundred parts by weight block copolymer rubber (phr)) ofstabilizers.

In accordance with a first embodiment, the non-flammable contactadhesive is composed of:

parts by weight per hundred % by parts by weight block weight copolymerrubber (PHR) Solvent Trans-dichloroethylene 61.87 (78.82% of solvent)Solstice ® PF-C 10.02 (12.76% of solvent) Vertrel ™ XF 6.61  (8.42% ofsolvent) Rubber Kraton ® D1164 4.53 40.00 Kraton ® D1126 4.53 40.00Vector ™ 2518 2.26 20.00 Tackifier TPR 160 1.05 9.28 Sylvatac ™ RE 981.05 9.28 Escorez ™ 1315 5.43 47.98 Escorez ™ 5637 1.05 9.28 Endex ™ 1600.34 3.00 Stabilizer/Antioxidant Irgafos ® 168 0.34 3.00 Irganox ® 10760.10 0.88 Irganox ® 1010 0.12 1.06

While a preferred embodiment is disclosed above, it is appreciated thecomposition of the non-flammable contact adhesive may be varied slightly(to accommodate various desired functional characteristics, for example,tack, adhesive heat resistance, etc.) and the following representsacceptable working ranges for the above embodiment:

parts by weight per hundred % by parts by weight block weight copolymerrubber (PHR) Solvent Trans-dichloroethylene   40-90 Solstice ® PF-C   5-20 Vertrel ™ XF    5-10 Rubber Kraton ® D1164  0.5-10 Rubber AlwaysKraton ® D1126  0.5-10 Totaling 100 PHR Vector ™ 2518  0.5-10 TackifierTPR 160  0.5-8 Tackifier Totaling Sylyatac ™ RE 98  0.5-8 70-130 PHREscorez ™ 1315  0.5-8 Escorez ™ 5637  0.5-8 Endex ™ 160  0.5-8Stabilizer/Antioxidant Irgafos ® 168 0.05-2 Stabilizer/AntioxidantIrganox ® 1076 0.05-2 Totaling 0.5-8 PHR Irganox ® 1010 0.05-2

As the ranges above show, it may be possible to replace chemicals withfunctionally similar chemicals.

In accordance with a second embodiment, the non-flammable contactadhesive is composed of:

parts by weight per hundred % by parts by weight block weight copolymerrubber (PHR) Solvent Trans-dichloroethylene 61.89 (78.85% of solvent)Solstice ® PF-C 10.00 (12.74% of solvent) Vertrel ™ XF 6.60  (8.41% ofsolvent) Rubber Kraton ® D1164 4.66 40.00 Kraton ® D1126 4.66 40.00Vector ™ 2518 2.33 20.00 Tackifier TPR 160 2.33 20.00 Sylvatac ™ RE 42911.17 10.04 Endex ™ 160 2.33 20.00 Piccolyte ® S125 5.84 50.13Stabilizer/Antioxidant Irgafos ® 168 0.32 2.75 Irganox ® 1076 0.09 0.77Irganox ® 1010 0.10 0.86

While a preferred embodiment is disclosed above in accordance with thesecond embodiment, it is appreciated the composition of thenon-flammable contact adhesive may be varied slightly (to accommodatevarious desired functional characteristics, for example, tack, adhesiveheat resistance, etc.) and the following represents acceptable workingranges for the above embodiment:

parts by weight per hundred % by parts by weight block weight copolymerrubber (PHR) Solvent Trans-dichloroethylene   40-90 Solstice ® PF-C   5-20 Vertrel ™ XF    5-20 Rubber Kraton ® D1164  0.5-10 Rubber AlwaysKraton ® D1126  0.5-10 Totaling 100 PHR Vector ™ 2518  0.5-10 TackifierTPR 160  0.5-8 Tackifier Totaling Sylyatac ™ RE 98  0.5-8 70-130 PHREndex ™ 160  0.5-8 S125  0.5-8 Stabilizer/Antioxidant Irgafos ® 1680.05-2 Stabilizer/Antioxidant Irganox ® 1076 0.05-2 Totaling 0.5-8 PHRIrganox ® 1010 0.05-2

The non-flammable contact adhesive of the present invention is madeusing normal mixing practices for making contact adhesives. Aerosol andcanister filling processes are also the same as normal filling withinthe aerosol and canister filling industry using nitrogen, CO₂ compressedair, HFA 134A (a tetrafluoroethane propellant), HFO 1234ze (atetrafluoropropene propellant) or any other nonflammable propellant. Asthe ranges above show, it may be possible to replace chemicals withfunctionally similar chemicals.

In accordance with an alternate embodiment, especially appropriate foruse with spray-type canister applications, the following formulationexhibiting a solids content of 21.5% has been found to be useful:

parts by weight per hundred % by parts by weight block weight copolymerrubber (PHR) Solvent Trans-dichloroethylene 1.52  (1.941% of solvent)Tert-butyl acetate 50.29 (64.062% of solvent) Solstice ® PF-C 14.86(18.930% of solvent) PCBTF 6.79  (8.654% of solvent) Vertrel ™ XF 5.04 (6.413% of solvent) Rubber Vector ® 4211A 4.66 40.00 Vector ® 4230 4.6640.00 Vector ® 2518 2.33 20.00 Tackifier Sylvatac ™ RE 4291 1.17 10.00Piccolyte ® S 125 5.84 50.05 Endex ™ 160 2.33 19.95Stabilizer/Antioxidant Irgafos ® 168/Alknox ® 240 0.32 2.738 Irganox ®1076/Anox ® PP18 0.09 0.776 Irganox ® 1010/Anox ® 20 PW 0.10 0.879

While a preferred embodiment is disclosed above in accordance with thethird embodiment, it is appreciated the composition of the non-flammablecontact adhesive may be varied slightly (to accommodate various desiredfunctional characteristics, for example, tack, adhesive heat resistance,etc.) and the following represents acceptable working ranges for theabove embodiment (wherein the solids content ranges from 15% to 36% (asshown in the range shown where the first % is for a 15% solids contentrange and the second % is for a 36% solids content range:

parts by weight per hundred parts by weight % by block copolymer weightrubber (PHR) Solvent Trans-dichloroethylene 1.59-1.24  (1.941% ofsolvent) Exempt Solvent Tert-butyl acetate 52.53-41.00 (64.062% ofsolvent) Solstice ® PF-C 15.52-12.12 (18.930% of solvent) PCBTF7.10-5.54  (8.654% of solvent) Non-Flammable Vertrel ™ XF 5.25-4.10 (6.413% of solvent) Rubber Vector ® 4211A 3.90-7.81 40.00 Vector ® 42303.90-7.81 40.00 Vector ® 2518 1.95-3.90 20.00 Tackifier Sylvatac ™ RE4291 0.98-1.95 10.00 Piccolyte ® S 125 4.89-9.77 50.05 Endex ™ 1601.95-3.90 19.95 Stabilizer/Antioxidant Irgafos ® 168/Alknox ® 2400.27-0.54 2.738 Irganox ® 1076/Anox ® PP18 0.08-0.15 0.776 Irganox ®1010/Anox ® 20 PW 0.09-0.17 0.879 Contact Adhesive PHR Ranges Rubberwill always have a total of 100 PHR. Resin has a range between 70-130PHR Antioxidant has a range between 0.5-8

While it is disclosed above that the non-flammable contact adhesive ofthe present invention may be used in conjunction aerosol and canisterapplications (that is, spray usage) through implementation ofconventional filling processes, a preferred filling process is describedherein. In accordance with such a filling process, CO₂ gas is added tothe sealed canister after the non-flammable contact adhesive describedabove is placed within the sealed canister. In accordance with thisembodiment, 1.5 pounds of CO₂ gas are added per 30 pounds of theadhesive non-flammable contact adhesive (that is, the cumulative weightof the solvent, copolymer rubbers, tackifiers, and stabilizer resins).After the CO₂ gas is added, nitrogen gas is added until the pressure ofthe canister reaches approximately 250 psi. The addition of the nitrogenafter the CO₂ gas appears to push the CO into the non-flammable contactadhesive (that is, dissolve it into the adhesive) such that when thenon-flammable contact adhesive is ultimately sprayed, the CO₂ gas actslike a conventional propellant. It has been found that this results inimproved spray patterns with either a total lack of or minimal drippingno matter how large or small the spray fan is.

With reference to FIG. 1, suppression of flammable solvents is achievedin accordance with the present invention by carefully balancing thenonflammable solvents and flammable solvents to produce a solvent blendoffering evaporation rates conducive to achieving a non-flammablecontact adhesive. In particular, the evaporation rates of the fastevaporating nonflammable solvents (for example, Solstice® PF-C) and theevaporation rates of the slow evaporating nonflammable solvents (forexample, Vertrel™ XF) are considered in conjunction with the evaporationrates of the fast evaporating flammable solvents (for example,Trans-dichloroethylene, tert-butyl acetate) and the evaporation rates ofthe slow evaporating flammable solvents (for example, PCBTF) to producea solvent blend having an evaporation rate conducive to the manufactureof the present non-flammable contact adhesive. In accordance with thepresent invention, each blend of solvents is tested with a close cupflash point tester at 0° C., 10° C., 20° C., 30° C., 40° C., 50° C. and60° C. If a flash is detected at any interval the blend is consideredflammable and inappropriate for utilization in accordance with thepresent invention. In addition to those solvents disclosed above, othersolvents may be use in accordance with the present invention, forexample, fast evaporating nonflammable solvents such as Solstice® PF,slow evaporating nonflammable solvents such as Vertrel™ Sinera/HFX 110(a hydrofluorocarbon, in particular, methoxytridecafluoroheptene),Opteon™ Sion (a blend of proprietary fluids and trans-1,2-dichloroethylene (t-DCE) with azeotrope-like properties), and Vertrel™X-T85 (a proprietary hydrofluorocarbon fluid); fast evaporatingflammable solvents such as MEK (methyl ethyl ketone); and slowevaporating flammable solvents such as toluene and lactol (that is, thecyclic equivalent of a hemiacetal or a hemiketal wherein the compound isformed by the intramolecular nucleophilic addition of a hydroxyl groupto the carbonyl group of an aldehyde or a ketone (for example, Calumet210-245).

As briefly discussed above, the present non-flammable contact adhesivemay be used for both aerosol applications and for bulk applications (forexample, conventional brush, canister adhesive, or spray frompressurized spray pots like normal contact adhesive). Where thenon-flammable contact adhesive is used in conjunction with aerosolapplications (that is, as an aerosol adhesive), the non-flammablecontact adhesive will have a starting adhesive concentrate with a rangeof solids between 15%-26%. The propellant used could be HFC-134A (Dymelpropellant) or HFO-1234ze (Honeywell Solstice propellant) up to 16% byweight of final aerosol product with nitrogen or carbon dioxide addedbetween 1%-7% by weight. Where the non-flammable contact adhesive isused for bulk applications it may be employed as described above in thevarious embodiments.

While the preferred embodiments have been shown and described, it willbe understood that there is no intent to limit the invention by suchdisclosure, but rather, it is intended to cover all modifications andalternate constructions falling within the spirit and scope of theinvention.

The invention claimed is:
 1. A non-flammable contact adhesive,comprising: a chemically distinct solvent comprised of a mixture offlammable and non-flammable components; chemically distinct copolymerrubbers; chemically distinct tackifiers; chemically distinct stabilizerresins; and carbon dioxide gas.
 2. The non-flammable contact adhesiveaccording to claim 1, wherein the carbon dioxide gas is included at aratio of 1.5 pounds of carbon dioxide per 30 pounds of the cumulativeweight of the solvent, copolymer rubbers, tackifiers, and stabilizerresins.
 3. The non-flammable contact adhesive according to claim 2,further including nitrogen gas.
 4. The non-flammable contact adhesiveaccording to claim 1, wherein the non-flammable contact adhesive is anaerosol adhesive.
 5. The non-flammable contact adhesive according toclaim 1, wherein the solvent is comprised of trans-dichloroethylene, ahydrofluoroolefin, and a hydrofluorocarbon fluid.
 6. The non-flammablecontact adhesive according to claim 5, wherein the solvent is comprisedof 40 to 90 weight percent of trans-dichloroethylene, 5 to 20 weightpercent of hydrofluoroolefin, and 5 to 20 weight percent ofhydrofluorocarbon fluid.
 7. The non-flammable contact adhesive accordingto claim 5, wherein the solvent is comprised of 40 to 90 weight percentof trans-dichloroethylene, 5 to 20 weight percent of hydrofluoroolefin,and 5 to 10 weight percent of hydrofluorocarbon fluid with zeroozone-depletion potential.
 8. The non-flammable contact adhesiveaccording to claim 5, wherein the copolymer rubbers are a mixture ofpoly(styrene-isoprene-styrene) resins andpoly(styrene-butadiene-styrene) resins.
 9. The non-flammable contactadhesive according to claim 8, wherein the copolymer rubbers arecomprised of approximately 80% poly(styrene-isoprene-styrene) resins and20% poly(styrene-butadiene-styrene) resins.
 10. The non-flammablecontact adhesive according to claim 5, wherein the hydrofluoroolefin istrans-1-chloro-3,3,3-trifluoropropene.
 11. The non-flammable contactadhesive according to claim 5, wherein the hydrofluorocarbon fluid is1,1,1,2,2,3,4,5,5,5-decafluoropentane.
 12. The non-flammable contactadhesive according to claim 5, wherein the solvent further includestert-butyl acetate and parachlorobenzotrifluoride (PCBTF).
 13. Thenon-flammable contact adhesive according to claim 12, wherein thehydrofluoroolefin is trans-1-chloro-3,3,3-trifluoropropene.
 14. Thenon-flammable contact adhesive according to claim 12, wherein thehydrofluorocarbon fluid is 1,1,1,2,2,3,4,5,5,5-decafluoropentane. 15.The non-flammable contact adhesive according to claim 1, wherein thecopolymer rubbers are a mixture of poly(styrene-isoprene-styrene) resinsand poly(styrene-butadiene-styrene) resins.
 16. The non-flammablecontact adhesive according to claim 15, wherein the copolymer rubbersare comprised of approximately 80% poly(styrene-isoprene-styrene) resinsand 20% poly(styrene-butadiene-styrene) resins.
 17. The non-flammablecontact adhesive according to claim 1, wherein the tackifiers at leasttwo resins selected rosin esters, aliphatic resins, cycloaliphatichydrocarbon resins, water-white thermoplastic resins made from purifiedaromatic hydrocarbon monomers, polyterpene resins, and terpene phenolicresins.
 18. The non-flammable contact adhesive according to claim 1,wherein the stabilizing resins are mixtures comprising at least twoselected from the group consisting of tris(2,4,-di-tert-butylphenyl)phosphite, octadecyl-3-(3,5-di-tert butyl-4-hydrophenyl)-propionate, orpentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate). 19.The non-flammable contact adhesive according to claim 1, wherein thenon-flammable contact adhesive has a percent solid level of 15% to 36%with the solvent constituting 64% to 85% by weight of the non-flammablecontact adhesive.
 20. The non-flammable contact adhesive according toclaim 1, wherein the non-flammable contact adhesive has 70 toapproximately 130 parts by weight per hundred parts by weight of a blockcopolymer rubber of tackifiers and 0.5 to 8 parts by weight per hundredparts by weight block of a copolymer rubber of stabilizers.